noun (n)

• a fat-soluble vitamin that is essential for normal reproduction; an important antioxidant that neutralizes free radicals in the body(noun.substance)

  Synonym:
  tocopherol, vitamin e
  

  source: wordnet30
• a radioactive transuranic element produced by bombarding plutonium with neutrons(noun.substance)

  Synonym:
  atomic number 99, einsteinium, es
  

  source: wordnet30
• the cardinal compass point that is at 90 degrees(noun.linkdef)

  Synonym:
  due east, east, eastward
  

  source: wordnet30
• the base of the natural system of logarithms; approximately equal to 2.718282...(noun.quantity)

  source: wordnet30
• the 5th letter of the Roman alphabet(noun.communication)

  source: wordnet30